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Fuel Cost Calculator

The quick answer to "how much will gas cost?" Type your distance, your car's mileage, and the pump price — get your fuel cost, cost per mile, and what your commute really runs you each month.

Estimated fuel cost
$0.00
Enter your trip details below
Fuel needed
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Cost per mile
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Cost per 100 miles
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Commuter check — monthly cost

Enter your daily round-trip commute to see what it costs you per month (22 workdays).

Per month
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Trip lengthFuel costFuel used

Table uses your car and gas price above — a quick way to compare short errands against long drives.

100% private

Everything runs in your browser. Your mileage and prices are never sent or stored.

No signup

No account, no email, no downloads. Just type and get your number.

Free forever

Unlimited calculations with no limits and no catch.

How to use the fuel cost calculator

  1. 1
    Enter your distance

    Type how far you are driving in miles — or switch to kilometers if you prefer metric.

  2. 2
    Add your car's mileage

    Enter MPG, L/100km, or km/L — whichever your dashboard shows. The math converts automatically.

  3. 3
    Set the gas price

    Type the pump price or drag the slider. Toggle between dollars per gallon and dollars per liter.

  4. 4
    Get your numbers

    See total fuel cost up top, plus cost per mile, gallons used, your monthly commute cost, and a trip-length comparison table.

Why drivers keep this one bookmarked

Made for daily driving

Unlike trip planners, this is the quick version: one drive, one number. Perfect for commutes, errands, and weekend drives.

Cost per mile at a glance

Know exactly what each mile costs you — the key figure for deciding whether to drive, carpool, or take the train.

True monthly commute cost

Enter your daily round trip and see the real monthly hit to your wallet across 22 workdays.

Compare trip lengths instantly

The comparison table shows fuel cost for trips from 10 to 500 miles with your exact car and gas price.

Three efficiency units

MPG, L/100km, or km/L — use the number your car actually displays, no manual conversion needed.

Gas-price slider

Drag the price slider to see how the next price hike — or dip — changes your cost in real time.

Fuel cost FAQs

How do you calculate fuel cost?
Divide the trip distance by your vehicle's fuel efficiency to get gallons used, then multiply by the gas price. Example: 120 miles at 28 MPG uses 4.29 gallons; at $3.90 per gallon that costs about $16.71.
What is a good cost per mile for fuel?
At 28 MPG and $3.90 per gallon, fuel costs about $0.14 per mile. Efficient hybrids can dip under $0.10 per mile, while full-size trucks often exceed $0.20 per mile.
How can I find my car's MPG?
Check the EPA sticker on a new car, your owner's manual, or fueleconomy.gov. Many cars also show average MPG on the dashboard trip computer — reset it after a fill-up for your real number.
Does this work with liters and kilometers?
Yes. Switch distance to km, efficiency to L/100km or km/L, and price to dollars per liter. Results always show gallons too, since US drivers think in gallons.
How is monthly commute cost figured?
Your daily round-trip distance is converted to fuel used, multiplied by the gas price, then multiplied by 22 workdays — the standard US working month.
Why does my actual cost differ from the estimate?
City driving, idling, AC use, and aggressive acceleration all lower real-world MPG below the dashboard average. If your numbers run high, try lowering the MPG input by 10 to 15 percent.
Is my data saved anywhere?
No. The calculator runs entirely in your browser — nothing you enter is transmitted or stored.

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